<template>
  <div class="login-container">
    <div class="logo" />
    <div class="form">
      <h1>登录</h1>
      <el-card shadow="never" class="login-card">
        <!--登录表单-->
        <!-- el-form- el-form-item- el-input -->
        <el-form v-if="currentLogin === 'phone'" ref="loginForm" :rules="loginRules" :model="loginForm">
          <el-form-item prop="mobile">
            <el-input v-model.trim="loginForm.mobile" placeholder="请输入手机号" />
          </el-form-item>
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" placeholder="请输入密码" show-password />
          </el-form-item>
          <el-form-item prop="isAgree">
            <el-checkbox v-model="loginForm.isAgree">用户平台使用协议</el-checkbox>
          </el-form-item>
          <el-form-item>
            <el-button style="width:350px" type="primary" @click="login">登录</el-button>
          </el-form-item>
        </el-form>
        <div v-else-if="currentLogin === 'qrcode'" class="qrcode-login">
          <!-- 二维码 需要使用canvas的dom对象 -->
          <div v-if="codeState === 2" class="qrcode-layer scan_success">
            <span>用户已扫码</span>
            <i class="el-icon-check" />
          </div>
          <div v-else-if="codeState === 4" class="qrcode-layer timeout" @click="createCode">
            <span>二维码失效</span>
            <i class="el-icon-refresh-right" />
          </div>
          <div v-else-if="codeState === 5" class="qrcode-layer timeout" @click="createCode">
            <span>用户已取消</span>
            <i
              class="el-icon-refresh-right"
            />
          </div>
          <canvas ref="qrcodeCanvas" />
        </div>
        <el-row style="width:350px" type="flex" justify="space-between">
          <el-button size="small" style="width:48%" @click="changeLogin('phone')">手机号登录</el-button>
          <el-button size="small" style="width:48%" @click="changeLogin('qrcode')">扫码登录</el-button>
        </el-row>
      </el-card>
    </div>
  </div>
</template>
<script>
import { getQrcodeKeyAPI, getQrCodeStateAPI } from '@/api/user'
import QrCode from 'qrcode'

export default {
  name: 'Login',

  data() {
    return {
      // 登录表单的校验的规则
      loginRules: {
        mobile: [
          { required: true, message: '请输入手机号', trigger: 'change' },
          { pattern: /^1[3-9]\d{9}$/, message: '手机号格式不正确', trigger: 'change' }

        ],
        password: [{ required: true, message: '请输入密码', trigger: 'change' },
          {
            min: 6, max: 16, message: '密码需要为6-16位之间', trigger: 'change'
          }
          // {
          //   pattern: /^.{6,16}$/, message: '密码需要为6-16位之间', trigger: 'change'
          // }
        ],
        isAgree: [{
          // rule规则
          // value值
          // callback
          validator: (rule, value, callback) => {
            value ? callback() : callback(new Error('请勾选用户平台协议'))
          }
        }]
      },
      // 绑定的数据对象
      loginForm: {
        mobile: process.env.NODE_ENV === 'development' ? '13800000002' : '', // 手机号 和接口文档对应
        password: process.env.NODE_ENV === 'development' ? 'hm#qd@23!' : '', // 密码 和接口文档对应
        isAgree: process.env.NODE_ENV === 'development' // 是否同意平台协议
      },
      currentLogin: 'phone', // phone/qrcode -登录模式
      qrCodeKey: '', // 加密串
      codeState: 1 // 正常状态

    }
  },
  watch: {
    currentLogin() {
      if (this.currentLogin === 'qrcode') {
        // 只要切换过来就生成
        this.createCode()
      } else {
        // 手机号登录
        clearInterval(this.timer) // 清理定时器
      }
    }
  },
  // 页面离开
  beforeDestroy() {
    clearInterval(this.timer) // 清理定时器
  },

  methods: {
    // 生成二维码
    async createCode() {
      this.codeState = 1 // 此时重新开始
      await this.getQrcodeKey() // 生成二维码- 此时一定有加密串 => 生成二维码
      // 此时已经有key了 要查了
      this.beginCheckLoop()
      QrCode.toCanvas(this.$refs.qrcodeCanvas, this.qrCodeKey, {
        width: 300,
        height: 300
      })
    },
    // 轮询-每隔一段时间就去服务器查一次
    beginCheckLoop() {
      // 检查逻辑
      const checkState = async() => {
        try {
          const { codeState, token } = await getQrCodeStateAPI({ qrcode_key: this.qrCodeKey })
          this.codeState = codeState // 存储状态
          if (this.codeState === 4 || this.codeState === 5) {
            clearInterval(this.timer)
          } else if (this.codeState === 3) {
            clearInterval(this.timer)
            this.$store.commit('user/setToken', token)
            this.$router.push('/')
          }
          console.log(codeState, token)
        } catch (error) {
          // 处理错误
          clearInterval(this.timer)
          this.codeState = 4 // 发生异常的情况下 把状态码设置成失效
        }
      }
      // 记录当前的标记
      this.timer = setInterval(() => {
        // 检查逻辑
        checkState()
      }, 1000)
    },
    // 获取加密串的方法
    async getQrcodeKey() {
      this.qrCodeKey = await getQrcodeKeyAPI()
    },
    // 切换登录方式
    changeLogin(mode) {
      this.currentLogin = mode
    },
    async login() {
      // this.$refs.loginForm.validate((isOK) => {
      //   if (isOK) {
      //     alert('校验通过')
      //   }
      // })
      try {
        await this.$refs.loginForm.validate() // await总是会等待后面的promise进行resolve
        await this.$store.dispatch('user/login', this.loginForm)
        // 跳转到主页
        this.$router.push('/')
      } catch (error) {
        console.log(error)
      }
    }
  }
}
</script>
<style lang="scss">
.qrcode-login {
    width: 350px;
    padding: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
  }
.login-container {
  display: flex;
  align-items: stretch;
  height: 100vh;
  .logo {
    flex: 3;
    background: rgba(38, 72, 176) url(../../assets/common/login_back.png)
      no-repeat center / cover;
    border-top-right-radius: 60px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    padding: 0 100px;
    .icon {
      background: url(../../assets/common/logo.png) no-repeat 70px center /
        contain;
      width: 300px;
      height: 50px;
      margin-bottom: 50px;
    }
    p {
      color: #fff;
      font-size: 18px;
      margin-top: 20px;
      width: 300px;
      text-align: center;
    }
  }
  .form {
    flex: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-left: 176px;
    .el-card {
      border: none;
      padding: 0;
    }
    h1 {
      padding-left: 20px;
      font-size: 24px;
    }
    .el-input {
      width: 350px;
      height: 44px;
      .el-input__inner {
        background: #f4f5fb;
      }
    }
    .el-checkbox {
      color:#606266;
    }
  }
}
.qrcode-layer {
  width: 150px;
  height: 150px;
  background-color: rgba(148, 228, 147);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  line-height: 150px;

}
</style>
